NEW BATTERY FOR SONY ERICSSON BST-37 W350a W350i W350c Count on staying connected by getting extra battery power today. Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). Integrated microchip prevents overcharging &amp; lengthens battery life. Compatible with Sony Ericsson Z300a / D750i, J100a / J100i, K600i, K608i, K610i, K750c / K750i, V600i, W550 / W550i, W600 / W600i, W710i, W800 / W800i, W810c / W810i, Z520 / Z520c / Z520i, *Z710i / Z525 / Z525a / Z525i / Z710i / W810 / K220i / V630i Best replacement for the original Sony Ericsson BST-37 battery with comparable standby and talk time. Great bargain with excellent quality guaranteed!